[FIX] DatePicker remains visible(block) when clicking multiple times on picker button.
[FIX] DatePicker remains visible(block) when clicking multiple times on picker button.

akretion/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web